4 protons, 5 neutrons, 4 electrons
The answer is: Freckles on the skin
Question 1 ) muscle cell maintains homeostasis is not an example of the <span>intracellular communication.
Question 2 ) </span>intracellular receptor goes into action <span>When non-nerve cells become involved in response to signals.</span>
HABITAT- marine environments that range from the shallow estuarine to the deep sea
ADAPTATIONS
1. They are five- sided radial symmetry
2. They are able to regenerate body parts , and some species of sea stars are even able to grow a new body from a severed arm.
3. They have a water vascular system
